Controlling interest description.

No definition available.

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- Definition

Organization and basis of presentation.

+ References

No definition available.

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- Definition

Percentage of related party's outstanding common stock owned by parent company.

+ References

No definition available.

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- Definition

Percentage of parent company's common stock held by private parent company and its subsidiaries.

+ References

No definition available.

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
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-Publisher FASB
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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 730
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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Summary of significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Organization And Basis Of Presentation [Line Items]
Capitalized interest costs		$ 1.5	$ 1.2	$ 1.1
Income taxes paid, net		17.3	37.3	41.6
Cost of sales		1,501.6	1,539.1	1,493.2
Research and development costs		18.0	15.0	17.0
Fixed asset impairment	$ 3.8
Shipping and Handling
Organization And Basis Of Presentation [Line Items]
Cost of sales		$ 101.0	122.0	132.0
Louisiana pigment company, L.P
Organization And Basis Of Presentation [Line Items]
Owned manufacturing joint venture	50.00%	50.00%
Valhi Inc
Organization And Basis Of Presentation [Line Items]
Income taxes paid, net		$ 11.8	$ 15.9	$ 17.6
Valhi Inc \| Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	50.00%	50.00%
Valhi Inc \| NL Industries Inc.
Organization And Basis Of Presentation [Line Items]
Ownership percentage in company	83.00%	83.00%
NL Industries Inc. \| Parent Company
Organization And Basis Of Presentation [Line Items]
Parent company ownership interest	31.00%	31.00%
Contran
Organization And Basis Of Presentation [Line Items]
Controlling interest description		Consequently, at December 31, 2023, Ms. Simmons and the Family Trust may be deemed to control Contran, and therefore may be deemed to indirectly control the wholly-owned subsidiary of Contran, Valhi, NL and us.
Contran \| Valhi Inc
Organization And Basis Of Presentation [Line Items]
Ownership percentage of parent company held by related party	91.00%	91.00%